IBM 486

IBM 486 Most of the IBM 486 CPUs were based on Intel and Cyrix 386 cores, which IBM extended with support for the 486 instruction set, wider busses and other features. Features 16 KB L1-Cache no L2-Cache 16 bit external bus (SLC, SLC2), 32 bit external bus (all others) 32 bit internal bus max of 16MB addressable memory (on the SLC and SLC-2 only)

Available Types and ThinkPads featuring them

Model/Freq. (MHz)	FSB (MHz)	FPU	VCore (MHz)	TDP (W)	ThinkPad Models
486 DX4
100	33	•	...	...
75	25	•	...	...
Blue Lightning 486 DX2
80	40	•	...	...
66	33	•	...	...
50	25	•	...	...
486 DX2
80	40	...	...	...
66	33	...	...	...
50	25	...	...	...
Blue Lightning 486 BLX3
100	33	...	...	...
75	25	...	...	...
60	20	...	...	...
45	15	...	...	...
Blue Lightning 486 BLX2
66	33		...	...
50	25		...	...	510CS
40	20		...	...
30	15		...	...
Blue Lightning 486 BLX - 0.8µm
33	33		3.3	...
25	25		3.3	...
20	20		3.3	...
15	15		3.3	...
486 DLC2
66	33	...	...	...
486 DLC
33	33	...	...	...
486 SLC2
80	40		3.3	...
66	33		3.3	...	340CSE
50	25		3.3	2.3	340CSE, 500, 555BJ, 720, 720C, 340
40	20		3.3	1.7
32	16		3.3	...
486 SLC
25	25		3.3	1.3
25	25		...	...	550BJ, 700, 700C, 710T
20	20		3.3	1.0
20	20		...	...
16	16		...	...